Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
  • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
  • B05B3/08—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements
  • B05B3/082—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements the spraying being effected by centrifugal forces
  • B05B3/085—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements the spraying being effected by centrifugal forces in association with sectorial deflectors

Definitions

• the invention relates to a device for spraying a liquid, in which a rotating surface is partially encased by a housing with an opening leaving a partial circumference, and the device for collecting retained drops has a reservoir and a flow path, in the circulation of which a pump is provided , the collected liquid is again combined with the inflowing liquid.
• the drops are thrown off on all sides by a centrifugal disc in a plane perpendicular to their axis of rotation. Due to the action of gravity, the drops form a so-called spray cone, the diameter of which can be influenced by the speed of the centrifugal disc. To achieve a sufficiently fine and uniform droplet size, it is necessary to drive the centrifugal disc at a very high speed, for example 10,000 to 15,000 revolutions per minute. Although a very uniform droplet size of, for example, 35 ⁇ m can be achieved, the hollow cone produced during spraying has a relatively large diameter of, for example, 100 to 120 cm, which is undesirable for many applications.
• the spray width In agriculture, such devices are used to cover areas with herbicides. In order to be able to treat the areas between crop rows in a targeted manner, the spray width must be as wide as possible precisely set and direct the drop stream as precisely as possible onto the surface.
• a generic device for spraying a liquid is known from US Pat. No. 2,545,489.
• the rotating surface is partially encased in a housing and leaves an opening free over a partial circumference.
• To collect retained drops, it has a reservoir and a flow path, in the course of which a pump is provided in order to unite the collected liquid again with the inflowing liquid.
• This pump which returns the collected liquid, is designed as a truncated cone-shaped housing which, driven by a gear wheel, rotates at about 1/10 of the number of revolutions of the rotating surface.
• a second hub inclined with respect to the rotational axis of the rotating surface is provided, as well as a reduction gear with gear wheels, which correspondingly reduces the speed of the axis.
• the device also has a very complicated metering device which, by means of two valve plates, feeds the inflowing liquid and the returned liquid partially separately to the rotating surfaces.
• British publication GB 2 164 270 shows a device in which the pump for returning the liquid is designed as an axial pump.
• the object of the invention is to provide a segment rotary nozzle which can be produced with reduced effort and moreover has a longer life expectancy.
• a delivery surface of a pump preferably a friction pump
• a friction pump is arranged coaxially with the axis of rotation of the rotating surface.
• the pump is particularly inexpensive to manufacture.
• the measure that the rotating surface has an axis of rotation, which is inclined at an angle with respect to the horizontal, ensures that gravity facilitates the return of the liquid in the housing.
• the directional flow emerging from the opening can also be adapted to the desired spray width, for example by changing the opening sector. If the position of the opening is changed, it can be sprayed upwards, for example.
• the housing has webs on the inside for guiding the collected liquid.
• the device is assigned a metering pump for supplying liquid, the conveying direction of which is reversible. If, in addition, it has a line for supplying liquid which is arranged in the mouth of the reservoir, then the metering pump provided can also take over the suction by reversing the direction of rotation.
• FIG. 2 is a plan view of the nozzle housing according to arrow direction II in Figure 1,
• FIG. 3 shows a top view of the nozzle cover with a centrifugal disc according to arrow direction III in FIG. 1,
• Fig. 4 shows the flow diagram of a spray device
• Fig. 5 is an exploded view of the device according to the invention.
• 1 denotes a centrifugal disc rotating about axis 2, from the outer edge of which drops are thrown off as a rotating surface.
• the centrifugal disc is encased in housing 3. About a part of the
• An opening 4 extends in the housing of the centrifugal disc.
• the housing 3 consists essentially of the nozzle body 5 and cover 6.
• two segment aprons 9 and 10 (FIG. 3) which are also displaceable about axis 2 along two arc-shaped adjustment openings 17 (FIG. 3) are arranged in the lateral edge region. Opening 4 can thus be changed by adjusting the segment aprons 9 and 10 (FIG. 3). This can affect the spray width. If the opening is moved upwards, for example, by changing the cover 6, it is also possible to spray against the direction of gravity. It is important that the reservoir 29 remains below.
• Pump disk 30 is integrally formed coaxially on the centrifugal disc 1 and thereby firmly connected to the drive shaft 12 of the centrifugal disc. Drive shaft 12 is part of a suitable motor 14.
• the centrifugal wheel 1 and the pump disk 30 formed thereon are fixedly connected to the drive shaft 12 by means of webs 15.
• a feed opening 16 is provided, through which liquid to be sprayed is passed into the housing 3 formed by the nozzle body 5 and cover 6.
• pump disk 30 rotates in the direction of arrow 19 (FIG. 3).
• FIG. 2 shows a view of the interior of the nozzle body 5 with nozzle feeding according to arrow direction II in FIG. 1.
• the same parts are provided with the same reference numerals as in the other figures.
• Crosspieces 23, 24 within the nozzle body 5 serve to guide the liquid.
• Arrows 28 are additionally shown in FIG. 2 to explain the flow path of a liquid to be sprayed.
• the liquid is supplied via a line system through the supply line 16 to the inner recess of the nozzle body 5.
• the liquid flowing in through opening 16 is directed in the direction of the flow path 27 of the beak-like half-open channel 13 which is arranged in the center of the nozzle body 5 and which is molded onto the webs 24.
• the liquid is then fed from the groove 13 to the inside of the centrifugal disc 1.
• the centrifuged liquid is collected by the cylindrical inner surface of the cover 6 (FIG. 3).
• This part of the liquid is derived from surface 7 of cover 6 and flows under the force of gravity into the lower housing part of nozzle body 5, which is formed by cylindrical surface 8 and serves as reservoir 29.
• the liquid collected in the reservoir 29 passes through opening 22 into the area of the pump disk 30, where it is carried along by the pump disk 30, in order to be conveyed again via ramp 25 along the flow path indicated by arrow 26/28 into the upper area, in order to Slant 11, trough 13 to be fed to the centrifugal disc 1 together with the inflowing liquid.
• FIG. 4 shows schematically the operation of the device.
• a volume flow VI is drawn from line L1 by means of a metering pump P1 and fed to the centrifugal disc 1.
• a partial volume V4 of the drops formed is spun off. The rest is retained in the housing 3 and collected in the reservoir 29.
• the centrifugal disc 1 is driven by means of a motor 14 via drive axle 12.
• the volume flow V3 is conveyed from the reservoir 29 by means of a pump disc 30 and combined with the supplied volume flow VI, and in turn is given to the centrifugal wheel 1.
• the alternative line guide L3 shown in broken lines possible, which, however, as described, requires a different behavior of the device.
• FIG. 5 shows exploded view of the device. The same parts are provided with the same reference numbers. The one in dash-dotted lines
• Axis 2 shown here indicates the coaxial assignment of the individual parts.
• the nozzle body 5 is accordingly mounted on a mounting plate 31.
• motor 14 are assembled into a further assembly group after plugging into cover 6 and fitting motor housing 34.
• the shaft 12 of the motor 14 is then attached to the centrifugal disc 1 by means of a coupling 32.
• Seal 33 in the assembly joint between the motor housing 34 and cover 6 and compression fitting 35 for the passage of cable 36 protect the motor from environmental influences.

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=6494784

Family Applications (1)

Country Status (4)

Cited By (1)

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Citations (4)

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• 1993
  • 1993-08-03 DE DE4326714A patent/DE4326714A1/de not_active Withdrawn
• 1994
  • 1994-07-29 EP EP94926133A patent/EP0776252B1/de not_active Expired - Lifetime
  • 1994-07-29 WO PCT/EP1994/002529 patent/WO1995003893A1/de active IP Right Grant
  • 1994-07-29 DE DE59409554T patent/DE59409554D1/de not_active Expired - Lifetime
  • 1994-07-29 US US08/596,150 patent/US5788156A/en not_active Expired - Lifetime

Patent Citations (4)

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